The egg is propelled down the uterine tube by
A. suction from the uterine contractions.
B. simply drifting on the prevailing current of body fluids.
C. flagella.
D. uterine tube cilia and tubular muscle contractions.
Answer: D
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A scientist is studying some developing eggs from an ocean sample. The early embryos have divided only a few times, and all cells look identical. When the scientist carefully removes half the cells from an embryo, both clumps of cells are able to complete development, forming twins. The eggs can be identified as:
A. deuterostomes B. protostomes C. crustaceans D. cnidarians E. echinoderms 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 determinate and indeterminate development? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Researchers primarily use transgenic animals to do which of the following?
a. Study the effects of recombinant genes. b. Extract and manipulate nucleic acids. c. Create multiple copies of mutant genes. d. Regenerate damaged tissue and organs.
The primary viral cause of chronic diarrhea globally is ________.
A. adenovirus B. norovirus C. rotavirus D. Cryptosporidium E. arbovirus
A basement membrane ____
a. is a cell membrane b. is a specialized lipid bilayer c. forms on the surface of plant cells d. supports and organizes animal tissues e. is a sheet of non-fibrous material