The primer ______ is required for initiation of glycogen<br/>synthesis.

When glucose levels fall, the liver: A: releases glucagon B: stores glucose as glycogen C: breaks down stored glycogen D: makes glucose from fat

The sources of blood glucose include A: supply directly by breakdown of muscle glycogen B: supply directly by breakdown of liver glycogen C: produced by gluconeogenic pathway D: digestion and absorption of food

The blood glucose directly come from A: liver glycogen decomposition B: muscle glycogen decomposition C: digestion and absorption of dietary carbohydrates D: gluconeogenesis in liver E: glucose reabsorption in kidney

A glycogen molecule has only one reducing end, but has multiple non-reducing ends.

A glycogen molecule has only one reducing end, but has multiple non-reducing ends. A: 正确 B: 错误

The biological macromolecules that can be used as animal energy reserves include: A: choleserol B: nucleic acids C: glycogen D: fats E: proteins

The metabolic changes in the body during starvation are A: hepatic gluconeogenesis increases B: free fatty acids in blood reduce C: the levels of ketone bodies in blood increase D: hepatic glycogen breakdown enhances

糖原（glycogen）是含有分支的α-（1→4）糖苷键的葡萄糖残基的同聚物，支链在分支点处通过α-（2→6）糖苷键与主链相连。

Which one of the following enzymatic reactions is reversible? ( ) A: The reaction catalyzed by glycogen phosphorylase B: The reaction catalyzed by phosphoglycerate kinase C: The reaction catalyzed by pyruvate kinase D: The reaction catalyzed by fructose bisphosphatase-1 E: The reaction catalyzed by hexokinase