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Flashcards in BRS- HISTO CH 2 Deck (10)
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1

The nuclear pore complex
(A) permits free communication between the nucleus and the cytoplasm.
(B) is bridged by a unit membrane.
(C) islocatedonlyatspecificnuclearpore sites.
(D) permits passage of proteins via receptor- mediated transport.
(E) has a luminal ring that faces the cytoplasm.

D

2

Which one of the following nucleotides is present only in RNA?
(A) Thymine (B) Adenine (C) Uracil (D) Cytosine (E) Guanine

C

3

Anticodons are located in
(A) mRNA. (B) rRNA. (C) tRNA. (D) snRNP. (E) hnRNP.

C

4

DNA is duplicated in the cell cycle during the
(A) G2 phase. (B) S phase. (C) Mphase. (D) G1 phase. (E) G0 phase.

B

5

A male child at puberty is determined to have Klinefelter syndrome. Although the parents have been informed of the clinical significance, they have asked for an explana- tion of what happened. Identify the item that should be discussed with the parents.
(A) Trisomy of chromosome 21
(B) Loss of an autosome during mitosis
(C) Loss of the Y chromosome during meiosis (D) Nondisjunction of the X chromosome
(E) LossoftheXchromosome

D
these men have an XXY genotype (bar body)

6

Which one of the following is an inclusion not bounded by a membrane that is observ- able only during interphase?
(A) Nuclear pore complex
(B) Nucleolus
(C) Heterochromatin
(D) Outer nuclear membrane (E) Euchromatin

B

7

A structure that is continuous with RER is the
(A) nuclear pore complex. (B) nucleolus.
(C) heterochromatin.
(D) outer nuclear membrane. (E) euchromatin.

D

8

Identify the structure that controls move-
ment of proteins in and out of the nucleus.
(A) Nuclear pore complex
(B) Nucleolus
(C) Heterochromatin
(D) Outer nuclear membrane (E) Euchromatin

A

9

The site of transcriptional activity is the
(A) nuclear pore complex. (B) nucleolus.
(C) heterochromatin.
(D) outer nuclear membrane. (E) euchromatin.

E


The pale-staining euchromatin is the transcriptionally active chromatin in the nucleus (see Chapter 2 V A).

10

Clumps of nucleoprotein concentrated near the periphery of the nucleus are called
(A) nuclear pore complex. (B) nucleolus.
(C) heterochromatin.
(D) outer nuclear membrane. (E) euchromatin.

C
Heterochromatin is the dark-staining nucleoprotein near the periphery of the nucleus. It is transcriptionally inactive but may be responsible for proper chromosome segregation