問題詳情
17. Which of the following statements describes chromatin?
(A)Heterochromatin is composed of DNA, whereas euchromatin is made of RNA.
(B)Both heterochromatin and euchromatin are found in the cytoplasm.
(C)Euchromatin is highly condensed, whereas heterochromatin is less compact.
(D) Heterochromatin is not transcribed, whereas euchromatin is transcribed.
(E)Only euchromatin is visible under the light microscope.
(A)Heterochromatin is composed of DNA, whereas euchromatin is made of RNA.
(B)Both heterochromatin and euchromatin are found in the cytoplasm.
(C)Euchromatin is highly condensed, whereas heterochromatin is less compact.
(D) Heterochromatin is not transcribed, whereas euchromatin is transcribed.
(E)Only euchromatin is visible under the light microscope.
參考答案
答案:D
難度:適中0.666667
統計:A(1),B(4),C(5),D(28),E(0)
內容推薦
- Karyotyping can be used to detect the following diseases EXCEPT(A)Klinefelter syndrome.(B)cri du
- During the redox reaction in glycolysis, ______ acts as the oxidizing agent and ______ acts as th
- Which of the following would be an immediate result of growth factor binding to its receptor?(A)a
- Which type of receptors also functions as a transcription factor?(A)G protein-coupled receptors(B
- What transport protein might you expect to see in the membrane of a lysosome?(A)a proton pump(B)a
- Passage 2It is widely known that languages change over the years, and therefore is not easy to estim
- How might a plant cell compensate for the excessive membrane fluidity that occurs during prolonge
- According to the passage, which of the following sentences is correct?(A) The morality bank
- Upon hearing the bell ring, _____.(A) the student’s departure was hasty(B) we departed hastily(C
- Males afflicted with Kartagener’s syndrome are sterile because of immotile sperm, and they tend t
內容推薦
- CAM (crassulacean acid metabolism) plants such as cacti differ from standard C4 plants such as co
- Which of the following would occur from a mutation in the gene's promoter region?(A)The seq
- Why do some scientists believe that RNA, rather than DNA, was the first genetic material?(A)All
- Which of the following is NOT a defining trait of the phylum Chordata?(A)notochord(B)vertebrae(C
- All of the following occur during the mitotic (M) phase EXCEPT(A)cytokinesis.(B)fragmentation of
- Based on the gene and protein sequences that follow, what type of mutation-polypeptide effect ha
- If the mitochondria and chloroplasts in eukaryotic cells resulted from endosymbiosis, what featu
- Which of the following is a plant growth response, not a behavioral response?(A)leaflet folding
- The exceptionally large diversity of antigen receptors found on B cells and T cells is mostly th
- Which of the following is WRONG concerning cancer cells?(A)They do not exhibit density-dependent
- A mutation causes a gene to become overactive, contributing to uncontrolled cell growth. Which t
- The plastids of the following are thought to be derived from ancestral red algae EXCEPT(A)green
- Why is the amniotic egg considered an important evolutionary breakthrough?(A)It prolongs embryon
- What is “matched” between donor tissue and recipient in order to increase likelihood of successf
- Which of the following is true concerning human sexual life cycle?(A)Gametes are produced by mit
- Why is there a need to produce Okazaki fragments on the lagging strand, but not on the leading s
- The presence of which class of biological molecules would allow you to distinguish between an ad
- Which of the following organ systems is INCORRECTLY matched with its function?(A)digestive—food
- Which combination of axon features should lead an axon to communicate with downstream cells most
- The major way that meiosis II differs from mitosis is that(A)in meiosis II, pairs of homologous
- Humans have fewer than 21,000 genes, but human cells can make 75,000-100,000 different proteins.
- Azidothymidine (AZT) is a nucleoside analog used to treat HIV infections. Which step does AZT ha
- How would a decrease in the number of corticosteroid receptors in the hypothalamus affect levels
- In vertebrate eyes, the conversion of light energy to chemical energy occurs most directly as th
- John and Mary are planning to start a family. John was married once before, and he and his first