Which feature is shared by euglenoids and kinetoplastids?
A. An eyespot
B. Flagellated
C. Photoautotrophy
D. Parasitic existence
E. Marine and freshwater habitats
Answer: B
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The sliding filament model of muscle contraction explains that:
A. Tropomyosin must be removed from the actin molecule before it can bind to myosin. B. Muscle contraction requires energy in the form of GTP. C. The sarcomere stretches to create contraction. D. Actin filaments slide past myosin, causing the shortening of the muscle fiber.
The gene Brachyury promotes development of the notochord and the vertebrae in vertebrate animals. Among the rodents, most species have a long tail, but capybaras have a very short tail. What is the most likely difference you might expect to see for the Brachyury gene in capybaras compared to long-tailed rodents?
A. A smaller range of gene expression B. Deletion of the gene C. Higher levels of expression D. An expanded range of gene expression E. Mutation to resemble the ascidian gene Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about the gene Brachyury? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
This cellular structure lacks a membrane:
A. microbody B. endoplasmic reticulum C. Golgi body D. nucleus E. nucleoid
Sperm pass through several stages during their development. What is the earliest stage in which the cell becomes haploid?
a. sperm b. secondary spermatocyte c. spermatogonium d. spermatid