The primary difference between different nucleated cells in a developing zygote is
a. the genetic code of each cell.
b. the expression of housekeeping genes.
c. the expression of a gene or group of genes.
d. the number of chromosomes present in the nucleus.
e. the presence or absence of gene regulators.
C
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Which number identifies the structure that carries supplemental genetic information?
a. 1 b. 2 c. 3 d. 4 e. 5
Male hummingbirds flash a patch of iridescent feathers on their neck called the gorget. This behavior makes them very visible. Why advertise their presence to a predator?
A. Hummingbirds are so fast that predation is not a large factor for them. B. Predators cannot see colors so are not alerted. C. The benefits of defending a territory exceed the costs of predation. D. This is an example of a maladaptive behavior that decreases overall fitness. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about the tradeoff of being visible to potential mates and predators? What other information is related to the question? Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In contrast to the cephalic and absorptive phases, the fasting phase is characterized by high blood levels of ________ and low levels of _______.
(a) glucagon; insulin (b) pepsin; insulin (c) insulin; glucagon (d) insulin; pepsin
Which term refers to a special capsule or chamber where a plant will make the first cells of the gametophyte generation?
a. sporangium b. rhizome c. vascular system d. shoot system