Where does the female gametophyte form in flowering plants?
a. in a stamen
b. in a carpel
c. in a corolla
d. in a receptacle
Ans: b. in a carpel
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Baculovirus genomes are 133.9 kb long and encode over 150 genes. This suggests that
A. their protein structures are very complex B. their protein coats consist of very few types of protein subunits C. their genetic material is RNA D. their genetic material is DNA E. they have a small host range
A sensory system includes
1.a sensory receptor. 2.nerve pathways from the receptor to the brain. 3.brain regions in which the sensory information is processed. 4.only a sensory receptor and nerve pathways from the receptor to the brain. 5.a sensory receptor, nerve pathways from the receptor to the brain, and brain regions in which the sensor information is processed.
Although they are smaller than K+, Na+ ions fail to pass through K+ channels because Na+
A) is repulsed by positively charged amino acids at the mouth of the channel. B) is too small to interact with oxygen atoms in amino acids on all sides of the channel and therefore does not completely lose its waters of hydration. C) is always transported complexes to Cl?. D) is always transported in a complex with two other Na+ ions. E) is attracted by other Na+ ions, which are at higher concentration outside than inside the cell.
Scientists are attempting to make a chicken look like a dinosaur ("dino-chicken") by using drugs or proteins to turn on certain homeotic genes in somatic cells during the development of a chicken embryo. If the scientists are successful in creating both
male and female "dino-chickens," and then the "dino-chickens" mate, what type of offspring would the two "dino-chickens" have? A) a male or female "dino-chicken" B) a male or female normal chicken C) You can't know for sure because of random fertilization. D) You can't know for sure because it depends on whether the modified homeotic genes are dominant or recessive.