In an isotonic contraction of a skeletal muscle,

(a) the tension in the muscle increases.
(b) movement occurs.
(c) no movement occurs.
(d) both a and c occur.


(b) movement occurs.

Biology & Microbiology

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Cells conserve energy and resources by making active proteins only when they are needed. If a protein is not needed, which of the following methods of control would be the most energy-efficient?  

A.  block transcription B.  degrade the mRNA after it is made C.  prevent translation of the mRNA D.  degrade the protein after it is made 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 transcription and translation? Consider Possibilities · What other information is related to the question? · What other information is related to the question? Which information is most useful? · 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?

Biology & Microbiology

Which statement concerning root hairs is not correct?  

A.  Root hairs are tubular extensions of individual epidermal cells. B.  A root hair is isolated from its epidermal cell with a cross wall. C.  Root hairs generally live only a few days before being sloughed off. D.  Root hairs increase the absorption of water and minerals. E.  Root hairs are located in the zone of maturation of a root.

Biology & Microbiology

Which of the following structures would be

most attractive to a fire ant?

a. an electric can opener b. a canvas patio umbrella c. aluminum foil d. a ceramic flower pot e. a leather sofa

Biology & Microbiology

The body weight of a healthy adult male is what percent fluid?

a. 30% b. 40% c. 50% d. 60% e. 65%

Biology & Microbiology