問題詳情
21. Which of the following is true of chromatin?
(A) Heterochromatin has more acetyl groups on the histones.
(B) Heterochromatin has fewer methyl groups on the DNA.
(C) Active genes are not bound by nucleosomes.
(D) Sequence-specific DNA binding proteins can only activate transcription.
(E) The chromatin structure on a particular gene may be different in different cells.
(A) Heterochromatin has more acetyl groups on the histones.
(B) Heterochromatin has fewer methyl groups on the DNA.
(C) Active genes are not bound by nucleosomes.
(D) Sequence-specific DNA binding proteins can only activate transcription.
(E) The chromatin structure on a particular gene may be different in different cells.
參考答案
無參考答案
內容推薦
- Which of the following processes does NOT occur in the eukaryotic nucleus?(A) RNA splicing. (B)
- For cloning of genomic DNA sequences, yeast artificial chromosome (YAC) and bacterialartificial
- If the genes of a cell's spliceosomes were mutated so the spliceosomes no longer action nor
- The nuclear genomes of eukaryotes are composed of different categories of sequences. Repetitives
- If the homeotic genes are mutated and cannot be expressed in an orchid during flowerdevelopment.
- Which statement about changing ecosystem properties during succession is FALSE?(A) Biomass incre
- A major perturbation of the carbon cycle by human activity is associated with(A) release of carb
- Phylogenetic trees are best described as(A) true and inerrant statements about evolutionary rela
- Estimates of the number of species present in a community(A) are not affected by the sampling ef
- Which of the following is an example of countercurrent exchange?(A) The flow of water across the
內容推薦
- The major lipids found in membranes are(A) triacylglycerols and cholesterol.(B) cholesterol and
- During glycolysis NADH is produced in the cytosol. Under aerobic conditions, what is theprimary
- 責任政治是民主政治的基本原則之一，尤其常被用於檢驗行政權擁有者的作為，強調必須對人民負起相對的責任。請下列關於責任政治的敘述何者正確？(A)地方首長與犯罪集團有不當往來，出面道歉並辭職下台(B
- 總統制強調權力分立，法律案及預算案一定要經過國會通過，總統簽署公布才生效。以美國為例，如果未完成上述程序，可能出現什麼狀況？(A)若是預算案沒有通過，表示總統不能得到國會支持，必須辭職以示負責
- 下列那一個國家的國會沒有質詢制度？(A)德國(B)法國(C)美國(D)日本
- Which of the following is NOT a post-translational modification?(A) Phosphorylation. (B) Glycosy
- 下列關於國不同類型的政治運作與政府體制設計的敘述，何者正確？(A)民主國家，必然有憲政運作的政治現況(B)國家元首為總統者，必為總統制國家(C)國家元首非世襲產生者，必屬民主國家(D)非民主獨
- Adenylyl cyclase is to cAMP as ____________ is to AMP.(A) protein kinase C (B) phospholipase C (
- Which one of the following components is NOT necessary in an expression plasmid to be usefulin t
- 菲律賓通過修憲委員會所提出的修憲草案，將修改現行政府體制的中央集權成為聯邦制，總統任期由只能一任改成得連任一次，另增設總理一職，由國會多數黨黨魁出任，並為政府首長：總統仍是國家元首，任期五年，
- 在「依法行政」的原則中，特別其強調行政機關權力的行使，必須要有明確的法律授權，始得合理干預人民的權利。下列哪些情形之發生，行政機關有違反「依法行政」原則？(A)為了捷運的通行路線之需要，政府依
- 在總統制的政府運作模式中，總統公布法律不需部會首長的副署，主要原因可能為下列者？(A)因總統為國家元首兼最高行政首長，所有由其負擔法律實施後的成敗結果(B)總統由人民選舉產生，不須對國會負責，
- Which of the following phenols is the most acidic?(A) (B) (C) (D) (E)
- 多重選擇題；每題至少有一個正確選項。每題 2 分，答錯不倒扣，錯一個選項扣 0.8 分，錯兩個選項扣 6 分，錯三個選項（含)以上扣 2 分，共 20 分。 美國總統川普下令空襲敘利亞空軍
- Which of the following is a possible application of tandem mass spectrometry?(A) Cell-specific g
- Inheritance of phenotype sometimes does not directly involving the nucleotide is termedepigeneti
- Which of the following is NOT correct regarding homeotic genes?(A) Homeotic genes encode transcr
- Ribosomes attached to rough ER are the site for synthesis of many types of secretary proteins.Wh
- MPF is a cyclin-Cdk complex that was discovered first in Xenopus egg. Its activity fluctuatesdur
- Which one is the correct sequence of protein synthesis?An aminoacyl-tRNA binds to the A site2
- Which of the following human DNA polymerases is responsible for replicating the mitochondrialDNA
- Which one is correct for the description of transposons?(A) It occurs only in bacteria.(B) Some
- Proto-oncogenes can change into oncogenes that cause cancer, which one can best explain thechara
- Which one of modifications is likely to alter the rate at which a DNA fragment moves through age
- Which of the following is considered an intrinsic isolating mechanism?(A) Gametic incompatibilit