Which important finding from the fossil record supports the theory of evolution?
a. Life has evolved over time.
b. All life evolved in the ocean.
c. Most species are actually extinct.
d. There is an inaccuracy in the fossil record.
e. Ancient species greatly differed from those alive today.
a
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If a pollen grain fails to generate two sperm cells, what is the most likely result of pollination?
A. Half the seeds would develop fine, but the other half would die. B. The resulting progeny would be haploid. C. The seeds would lack either embryos or endosperm, and so would be nonviable. D. The endosperm would be smaller. 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 plant gametes and fertilization? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process 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?
Which of the following is not true of fluorescent in situ hybridization (FISH)?
A. It can be used to identify unknown bacteria without culturing. B. It can be used to detect RNA in cells. C. Probes can locate genes on chromosomes. D. It uses electrophoresis to separate the DNA. E. Probes can be applied to intact cells.
Name the male accessory sexual glands and characterize the organs and their secretions
What will be an ideal response?
One of the major differences between the first and second line of defense is that
A. the first line defenses are anatomical barriers whereas the second line defenses are mechanisms. B. the first line defenses are mechanisms whereas the second line defenses are physical barriers to infection. C. the first line defenses involve the respiratory tract whereas the second line defenses involve the gastrointestinal tract. D. the first line defenses involve complement proteins whereas the second line defenses involve antibodies.