After bringing a small plant into the biology lab, you prepare microscope slides of the shoot. Near the tip of the shoot, you observe a dense patch of cells that seem to be actively dividing in a way that would cause the shoot to continue growing in length. This patch of cells is the
A. vascular bundle.
B. apical meristem.
C. lateral meristem.
D. intercalary meristem.
E. tracheid.
B. apical meristem.
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In fruit flies, an X-linked dominant mutant allele of the Notch gene (N) causes Notched wings in heterozygous females but is lethal in hemizygous or homozygous condition. What ratio of offspring would be observed in a cross of a Notched-wing female with a normal male?
A) 1/3 Notched-wing females, 1/3 normal females, 1/3 normal males B) 1/4 Notched-wing females, 1/4 normal females, 1/4 Notched-wing males, 1/4 normal males C) 1/2 Notched-wing females, 1/2 normal males D) 1/2 normal females, 1/2 Notched-wing males E) 2/3 Notched-wing females, 1/3 normal males
The process of DNA replication can be described as which of the following?
a. total displacement b. semi-conservative c. conservative d. dispersive
On the island of Madeira, two populations of house mice have accumulated different Robertsonian translocation. Which are true about these two populations of mice? (Select all that apply.)
A) They have fewer chromosomes than mice in other areas of the world. B) They are isolated from each other geographically. C) If mice from different populations mate, their offspring are sterile. D) Mice from different populations are unable to mate with each other. E) They are becoming extinct because of semi sterility.
One hypothesis explaining the first nucleated eukaryotic cell is based upon the fusion of an archaeon and a bacterium that, over time, saw archaeal genes involved in metabolism being lost while bacterial genes involved in information processing were also degraded.
Answer the following statement true (T) or false (F)