Forty-nine percent of a population is homozygous dominant for a particular trait. According to the Hardy-Weinberg law, the gene frequency of this dominant allele will be
A. 0.24.
B. 0.49.
C. 0.70.
D. 0.9.
C. 0.70.
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In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
Order the following statements to correctly describe the route of secreted protein as it is synthesized and secreted from a eukaryotic cell. _____ The protein folds and undergoes modification within the rough ER. _____ The protein travels within a membranous vesicle from the ER to the cis face of the Golgi apparatus. _____ Translation begins on a ribosome. _____ The protein travels toward the trans face of the Golgi, from which it is packaged into a secretory vesicle. _____ The secretory vesicle travels to and merges with the cell membrane, releasing its contents outside of the cell. _____ The ribosome attaches to the rough endoplasmic reticulum and the newly formed polypeptide is pushed into the lumen of the rough ER.
Fill in the blank(s) with the appropriate word(s).
The resting membrane potential is measured at ____
a. 0 mV b. 70 mV c. 100 mV d. -70 mV e. -100 mV
A mutation is ___________.
A. a temporary and reversible alteration in a DNA molecule B. a mistake that can occur in either transcription or translation C. a change in the nucleotide sequence of DNA D. blockage of the ribosome-binding sites