Which part of the muscle cell actually does the work of contraction by attaching, pivoting, and pulling?

A) myosin heads B) calcium ions
C) actin filaments D) neurotransmitter molecules


Answer: A

Biology & Microbiology

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A sign that mutation occurred in a person exposed to radiation in the aftermath of the Chernobyl disaster of 1986 was

A) acute radiation sickness in the exposed person. B) short DNA repeats in a child's genome that didn't match the size in either exposed parent. C) increased rates of asthma and allergies in the exposed people and their children. D) a child that failed an Ames test.

Biology & Microbiology

Which plant closes its stomata during the day and conducts photosynthesis using chemically stored carbon?

A) moss B) Kentucky bluegrass C) jade plant D) oak tree

Biology & Microbiology

Pure cultures can easily be obtained on streak plates, even if the desired bacteria are present in very low concentrations in the initial culture broth

Indicate whether the statement is true or false

Biology & Microbiology

The state of having more than two sets of chromosomes is called:

A) dominant. B) polyploidy. C) autosomal. D) nondisjunction. E) aneuploidy.

Biology & Microbiology