Chordin is an organizer protein found only in the dorsal regions of frog embryos. Removing chordin would most likely disrupt the determination of which structure?
A) central nervous system
B) digestive system
C) kidneys
D) lungs
Answer: A
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Females outnumber males in the tertiary sex ratio because genetic and ____________________ factors cause higher death rates among males
Fill in the blank(s) with correct word
The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.
Which of the following statements is false?
a. Axillary buds are found at the tip of the stems. b. Internodes are the spaces between leaves. c. Cotyledons are leaves within a seed. d. Ground tissue is the most common type of tissue in a plant. e. Dermal tissue covers the body of the plant.
What well-characterized sequence in E. coli is 245 bp, AT-rich, and divided into three 13-mers and four 9-mers?
What will be an ideal response?