Answer:
deoxyribonucleotides consist of a nitrogenous base and a pentose sugar with the nitrogenous bases covalently bonded to make the primary structure
Explanation:
A deoxyribonucleotide is a nucleotide that consists of a nitrogenous base (i.e., purine or pyrimidine) that binds to deoxyribose (i.e., a pentose sugar-containing five carbon atoms), and one phosphate group attached to the nitrogenous base. In the DNA, there are four types of nitrogenous bases: two purines (Adenine and Guanine), and two pyrimidines (Cytosine and Thymine). All these bases are attached to 1' carbon (C1') of deoxyribose by a glycosidic bond. A nucleoside is a nitrogenous base linked to ribose (in RNA) or deoxyribose (in DNA).
Answer:
Chromosomes condense before mitosis to allow them the ability to move smoothly, without becoming entangled and breaking. (So, they are conveniently packaged for cell division, in which the chromosomes must move to both poles of the cell.)
Explanation:Otherwise it would be a mess as they get tightly packed
Answer:
the answer is A
Explanation:
Taste stimuli produce depolarizing and hyperpolarizing potentials in individual taste cells.
Answer:
Non-coding DNA regions play important roles in regulating transcriptional activity by encoding different types of non-coding RNAs (ncRNAs), acting as scaffold attachment regions, acting as enhancer specific regions, etc.
Explanation:
Historically, it had been believed that non-coding DNA sequences were 'junk DNA' since they don't encode for proteins (beyond the sequences that are transcribed into functional non-coding RNAs, i.e., transfer RNA and ribosomal RNA). However, in the last years, it has been shown that non-coding DNA sequences play critical roles in regulating gene expression and genome function. For example, evolutionary conserved non-coding RNAs (ncRNAs) with regulatory roles on gene expression such as, for example, long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) have been mapped in non-coding DNA sequences, thereby evidencing the functional significance of these regions. In consequence, the conservative nature of certain non-coding DNA sequences evidence that mutations in such regions may have significant deleterious effects, and thereby they could have a negative impact on the fitness of the individual.
It’s a plus-plus, also known as mutualistic relationship. Our intestines provide a habitat for the good bacteria and in return the bacteria fend off bad bacteria from harming us.
