All of the following are germ layers EXCEPT

a. ectoderm.
b. mesoderm.
c. epiderm.
d. endoderm.


C

Biology & Microbiology

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The presence of cholesterol in the plasma membranes of some animal cells _____

A) enables the membranes to stay fluid when cell temperature drops B) enables the cell to remove hydrogen atoms from saturated phospholipids C) enables the cell to add hydrogen atoms to unsaturated phospholipids D) makes the cell membrane less flexible, allowing it to sustain greater intracellular pressure E) reduces mutations to genetic material inside the cell

Biology & Microbiology

Humans have ____ vertebrae

a. 21 b. 26 c. 23

d. 46 e. 58

Biology & Microbiology

There is a single gene that controls the ability to taste PTC paper. The ability to taste is dominant to the inability to taste. If you can taste the paper, it is very bitter. Which of the following genotypes can taste the paper?

A. only Pp B. both PP and Pp C. only pp D. both PP and pp E. only PP

Biology & Microbiology

The target cell concept is illustrated in the picture. Label the cells as either target cells or non-target cells by identifying A and B as such. Explain your answer.

What will be an ideal response?

Biology & Microbiology