What controls the shape of the lens?

A. pupil
B. iris
C. fovea centralis
D. ciliary muscle
E. cornea


Answer: D

Biology & Microbiology

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In commensalism

A. the host and commensal cannot be separated and remain viable and the commensal is metabolically dependent on the host. B. the commensal is metabolically dependent on the host. C. the host and commensal can be separated and remain viable. D. the host provides some factor that the commensal cannot get otherwise.

Biology & Microbiology

The phospholipids of plasma membranes have

a. a hydrophobic head and a hydrophilic tail. b. a hydrophobic head and a hydrophobic tail. c. a hydrophobic head and two hydrophobic tails. d. a hydrophilic head and two hydrophobic tails. e. a hydrophilic head and two hydrophilic tails.

Biology & Microbiology

Emery was in a serious accident and had to have a large part of his stomach surgically removed. He needed a transfusion at first, but soon he healed. However, after his recovery, he started having anemia

Why did he develop anemia, and how can this form of anemia be treated?

Biology & Microbiology

The phase before onset of DNA replication is the

A) G1 phase B) G2 phase C) S phase D) M phase

Biology & Microbiology