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Within vascular plants, the larger prominent plant is the_____; in nonvascular plants it is the _____
The light reactions of photosynthesis provides the Calvin cycle with _____.
ATP and NADPH
Mosses are dependent on water for reproduction because....
The evaporative loss of water from the leaf's stomata is called...
Which of the following statements about blocks to polyspermy in sea urchins is false?
a. Blocks to polyspermy are triggered by fusion of the plasma membranes of the sperm and egg and by entry of the sperm into the egg.
b. Blocks to polyspermy prevent more than one sperm from entering an egg.
c. The fast block causes release o the acrosomal enzymes.
d. The fast block results from a change in electric-charge difference across themembrane of the egg.
e. The slow block results form the release of calcium
In all the flowering plants, the outermost layer of cells arise from the _____ tissue system.
One benefit of sexual reproduction in plants is...
The creation of new combinations of genes and diverse phenotypes.
Root hairs are adaptations that
Increase surface area
By definition, a gametophyte must be
The root endodermis acts to regulate...
Water and minerals entering the roots vascular system from the root cortex.
Can increase an individuals inclusive fitness.
Short-day plants flower when the ____ period ______ a critical period.
The O2 gas produced during photosynthesis is derived from...
Which of the following is not a proximate mechanism for a behavior?
a. The binding of hormone to its receptor
b. The firing of neurons
c. The process of sexual selection
d. The capacity of certain bone membranes to capture sound waves.
e. All of the above are proximate mechanisms
All of the above are proximate mechanisms
The Calvin cycle uses ____ to produce glucose.
Seed dormancy is usually an adaptation to ensure that ...
Germination occurs at a favorable time.
The capture and digestion of anthropods allows carnivorous plants to...
Absorb otherwise unavailable nutrients.
Which of the following statements about the ovarian and uterine cycles is false?
a. Falling estrogen and progesterone levels induce menstruation.
b. A sudden rise in LH induces ovulation.
c. Estrogen levels rise in the first half of the ovarian cycle and progesterone levels rise int eh second half.
d. If fertilization occurs, the corpus luteum secretes hCG.
e. Estrogen is produced by follicle cells.
If fertilization occurs, the corpus luteum secretes hCG.
During oogenesis in mammals, the second meiotic division occurs...
in the formation of the secondary oocyte
Plants are green because...
Chloroplasts transmit green light.
You are given two flowers of the same species from two separate plants. One flower has only a pistil, where as the other has only stamens. Based on your observations, you conclude that the flowers are _____, and the species is ______.
In mammals, the sperm contributes _____ to the zygote.
A centriole and a nucleus.
The enzyme rubisco is found in...
The enzyme nitrogenase...
Allows normally unavailable atmospheric nitrogen to be reducted to available ammonia.
Plant shoots generally show ____ phototropism and ______ gravitropism.
Which of the following statements about a fixed action pattern is false?
a. It is usually a response to a releaser.
b. It is induced by complex, species-specific stimuli.
c. It is highly stereotypic and species-specific.
d. It can be expressed even if the animal has never seen it performed.
e. Its genetic basis can be demonstrated by breeding experiments.
It can be expressed even if the animal has never seen it performed.
Plants, which are mostly autotrophs, acquire carbon from...
The process by which the developmental fate of a cell is set is called...
With a few exceptions, mammals are...
Plants acquire minerals...
Which of the following processes is not increased by ethylene?
a. breakdown of fruit cell walls.
b. stimulation of leaf abscission
c. ripening of fruit
d. inhibition of stem elongation
e. ethylene affects all of these processes.
Ethylene affects all of these processes.
The three tissue systems of a vascular plant are...
In which of the following water potential conditions will water move from the root hairs through the cortex to the xylem?
a. Root hairs = 0, cortex = 0 xylem = 0
b. Root hairs = -1, cortex = -1 xylem = -1
c. Root hairs = -2, cortex = -1 xylem = 0
d. Root hairs = 0, cortex = +1 xylem = +2
e. Root hairs = 0, cortex = -1 xylem = -2
Root hairs = 0, cortex = -1 xylem = -2
a. is located on the outside of the embryo
b. lies between the endoderm and the ectoderm
c. is found in blastula-stage embryos
d. gives rise to the lining of the gut.
e. is formed during cleavage
lies between the endoderm and the ectoderm
Ion exchange allows plant roots to...
a. break down and dissolve minerals in the soil by acidifying the immediate soil environment.
b. use protons pumped from root cells to bind to nutrients.
c. release protons in return for positively charged nutrients that are bound to soil particles.
d. counteract the leaching of nutrients.
e. carry out respiration efficiently.
release protons in return for positively charged nutrients that are bound to soil particles.
Biologist refer to the environment in which an organism lives as its...
In heterosporous life cycle, the microspore develops into the ____ gametophyte, and the megaspore develops into the ____ gametophyte.
The main photosynthetic pigment in plants is ______
Which of the following statements about imprinting is true?
a. It requires a critical period.
b. It effects can last a long time.
c. It is a form of learning.
d. Both a and b
e. All of the above.
All of the above
Which of the following is the correct sequence of structures through which a mammalian sperm passes before fertilizing an egg?
a. Uterus, vagina, cervix, oviduct
b. Vagina, cervix, uterus, oviduct
c. Oviduct uterus, vagina, ovary, body cavity.
d. Vagina, cervix, oviduct, uterus.
e. Vagina, uterus, oviduct, body cavity.
Vagina, cervix, uterus, oviduct
Which of the following is the correct chronological order in the development of the female gametophyte?
a. Megagametophyte, megasporocyte, megaspore
b.Megagametophyte, megaspore, megasporocyte
c. Megasporocyte, megaspore, megagametophyte
d. Megaspore, meagsporocyte, megagametophyte.
e. Megaspore, megagametophyte, megasporocyte.
Megasporocyte, megaspore, megagametophyte
Which of the following does not occur during cleavage?
a. Rapid DNA replication
b. Cell growth
c. Differential distribution of nutrients and information molecules.
d. A rapid series of cell divisions
e. Formation of the blastula
Most sclerenchyma (ground tissue) cells and xylem (vascular tissue) cells..
a. function when dead
b. are found primarily in gymnosperms
c. lose part of all of their end walls.
function when dead
Which of the following is not a mechanism that allows plants to avoid interbreeding?
a. Genetic self-incompatibility
b. Dioecious seperation of flowers
d. Seperation of male and female flowers.
In organisms such as the chick, in which the egg has extensive yolk, the egg...
a. shows complete cleavage
b. shows incomplete cleavage
c. shows even distribution of the yolk
shows incomplete cleavage
The fruit generally develops from the ____ of the flower.
e. None of the above
Giberellins are plant hormones that affect...
a. stem growth
b. fruit size
c. seed germination
d. All of the above
e. None of the above
All of the above
Sexual reproduction has an evolutionary advantage over asexual reproduction because it...
promotes genetic variability to cope with changes in the environment.
Which of the following represents the correct chronological sequence of developmental events, from earliest to latest?
a. Formation of the neural tube, movement of neural folds, thickening of neural ectoder.
b. Movement of neural folds, formation fo the neural tube, thickening of neural ectoder.
c. Thickening of neural ectoderm, formation of the neural tube, movement of neural folds.
d. Thickening of neural ectoderm, movement of nerual folds, formation of the neural tube
e. None of the above.
Thickening of neural ectoderm, movement of neural folds, formation of the neural tube.
Which of the following is not one of the evolutionary adaptations to land shared by all land plants?
a. Waxy protective coverings
b. Support against gravity
c A means of taking up water from the soil.
d. Protective structures for new sporophyte
e. Water transport by xylem