During gastrulation, the cellular process by which ectoderm in the animal pole spreads toward the vegetal pole is called

A. epiboly.
B. invagination.
C. involution.
D. convergent extension.
E. apical constriction.


D. convergent extension.

Biology & Microbiology

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The RNA molecule is made up of how many

strands? a. 1 b. 2 c. 3 d. 6 e. 12

Biology & Microbiology

After loading wood into a fireplace, you realize you have gotten a splinter in your finger.  Within a short period of time, your finger is painful, red, and swollen, and is warm to the touch.  This is an example of ________.

A. acquired immunity B. specific resistance         C. adaptive immunity D. nonspecific resistance

Biology & Microbiology

A mycelium is a large intermeshed mat of _______.

A) Pseudohypha B) Hypha C) Sporangium D) Yeasts

Biology & Microbiology

What is the term used to define a secondary sexual characteristic in males, such as manes on lions or colorful plumage on peacocks?

A. gene flow B. fitness C. sexual selection D. sexual dimorphism

Biology & Microbiology