Most human embryos that are aneuploid
A. are usually the result of increased nondisjunction in the gametes of older men.
B. can develop and survive to adulthood.
C. result in sterility.
D. are spontaneously aborted in the first trimester.
E. result in Down's syndrome.
Answer: D
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In Sanger sequencing, what causes DNA synthesis to terminate at a specific base?
A) Restriction endonucleases cleave DNA after particular bases. B) Fluorescent molecules produce high-energy light that inactivates DNA polymerase. C) Incorporation of a deoxynucleotide that lacks a base causes DNA polymerase to stall. D) Incorporation of a dideoxynucleotide that lacks a 3? hydroxyl. E) Incorporation of a ribonucleotide that lacks a 5' phosphate.
Many zooplankton migrate to the surface to graze on phytoplankton during the day and retreat to deeper water during the night
Indicate whether the statement is true or false
Suppose that the first part of a new polypeptide chain being produced in a eukaryotic cell does NOT have a signal peptide. Where would this polypeptide be located within the cell as it is maturing?
a. in the Golgi apparatus only b. in the cytoplasm only c. first in the rough ER, and then in the Golgi apparatus d. first in the cytoplasm, and then in the rough ER
A patient is brought to the emergency room in a comatose state. The family reports he had complained of nausea and a bad headache in the past couple of days. They also report they had engaged in their normal summer activities: picnicking, fishing and
swimming at the lake near their home. His fever is high, and while in the ER, he has a seizure. Which of the following is likely to be responsible for his symptoms? A) Entamoeba histolytica B) Giardia intestinalis C) Gonyaulax D) Naegleria fowleri E) Toxoplasma gondii