Which of the following statements about the interactions between the hypothalamus and pituitary is false?
a. Most hypothalamic hormones that act on the anterior pituitary are releasers that encourage secretion of hormones by target cells
b. The hypothalamus has some neurons whose axons extend into the pituitary's posterior lobe.
c. The posterior lobe of the pituitary secretes hormones made in the hypothalamus.
d. Antidiuretic hormone (ADH) and oxytocin are synthesized in the cell bodies of neurons in the anterior pituitary.
d
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Imagine that DNA is composed of equal proportions of six different types of nucleotide, instead of the normal four. The six nucleotides are A, C, G, T, X, and Y. In this new type of DNA molecule, A pairs with T, C pairs with G, and X pairs with Y. What would be the average size of the DNA fragments produced when this new DNA is cut by a restriction endonuclease with a four-base recognition sequence?
A) 125 bp B) 256 bp C) 425 bp D) 1056 bp E) 1296 bp
A new plant forms from a stem that broke off of the parent plant. This is an example of _____
a. parthenogenesis c. vegetative reproduction b. exocytosis d. nodal growth
A limitation of retrovirus-mediated gene transfer is that ________
A) retroviruses cannot be used to make transgenic animals B) retroviruses only work with Ti vectors C) retroviruses only integrate DNA at specific sites D) retroviruses integrate DNA randomly in the genome E) retroviruses can only be used to make transgenic plants
Which of the following would not be a study of an organism in its natural environment?
a. a copperhead snake in an eastern deciduous forest b. a fruit fly at a picnic c. a child in a park d. a clown fish in an aquarium e. a lion on the African savanna.