How must spindle microtubules attach to chromosomes during anaphase of meiosis I?
A. Microtubules only attach to one
kinetochore per homologous pair.
B. Microtubules attach to the chiasma.
C. Microtubules attach using their minus
(slow growing) ends.
D. Microtubules attach at the centrosomes.
Ans: A. Microtubules only attach to one
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Examine the figure and statements below. Which one of the statements is incorrect?
A. mRNA for caudal and hunchback are evenly distributed in the oocyte, but bicoid and nanos mRNA are located either anteriorly or posteriorly, respectively. B. Bicoid protein promotes the transcription of the hunchback gene in the anterior region of the embryo. C. Nanos protein represses the translation of hunchback mRNA in the posterior region of the embryo. D. Bicoid protein represses the translation of caudal mRNA in the anterior region of the embryo. E. The expression pattern of Caudal and Hunchback proteins is an example of gene regulation at the level of translation.
Which is a characteristic of a plasmid used as a cloning vector? (Select all that apply.)
A) contains a selectable marker B) contains an origin of replication C) has several unique recognition sites for restriction enzymes D) integrates into the host chromosome E) can hold an insert of up to 300 kb
Which gene is recessive in the ABO blood group?
A. A B. B C. O D. none of them
Orchid bees are to Brazil nut trees as ________ are to pine trees
A) breezes B) rain droplets C) seed-eating birds D) squirrels