Economics Homework Help

Question 27

Since a carbon atom has 4 valence electrons, it can complete its valence shell by forming a total of 4 hydrogen bonds.

(A) True

B False

Question 28 Similar families of organisms are next grouped together in the same:

A phylum

B) order

c) genus

D class

E kingdom

Question 29 What does the nucleolus, within the nucleus, synthesize?

A genes

B) hormones

c) ribosomal RNA D DNA

E) messenger RNA

Question 30 If the hydrogen ion concentration of ammonia is 0.00000000001 mol / L, then what is its pH value? A -10

(B 11

C)10

D -11

E) 1

Question 31 What carbohydrate energy storage molecule is found in animal liver and muscle cells? A cellulose

B) starch glycogen

D cholesterol

E) a fatty acid Question

32 The cis face of the Golgi complex is most directly involved in which process? A synthesizing proteins

B transporting molecules out of the Golgi

C) accepting vesicles from the ER

D packaging molecules in vesicles

E catalyzing the efficient folding of proteins

Question 33 Methane, which is composed of carbon and hydrogen, lacks functional groups and is a gas at room temperature. Upon replacing one of the hydrogen atoms with a hydroxyl group, methane is converted to methanol, which is a liquid at room temperature. Explain the reason behind this difference in physical properties.

Question 34 In living organisms, chemical reactions responsible for growth, repair, and nutrition are collectively referred to as: A development

B metabolism

(C adaptation

D genetics

E) homeostasis

Question 35 The smooth ER is the primary site for the synthesis of phospholipids and cholesterol needed to make

A) cell membranes

B) hormones

C) ribosomes

D DNA ATP

Question 36 Figure 4-2 Use the figure to answer the corresponding question (s). The cellular structure indicated by the arrow in the accompanying figure is responsible for:

A) cellular respiration.

B protein synthesis.

C)replication.

D digestion of unused organelles.

E lipid and fatty acid metabolism.

Question 37 The covalent bond between a hydrogen atom and the oxygen atom in water is formed when:

A hydrogen and oxygen share an electron pair.

B) hydrogen and oxygen both lose electrons from their outer shells.

C) hydrogen gains an electron from oxygen.

D) hydrogen and oxygen both gain electrons in their outer shells.

E) hydrogen gains an electron from oxygen.

Question 38 How many molecules are present in one mole of C6H1206?

A 1.3 x 1010 molecules

B)1.7 x 10-10 molecules

(c) 1.7 × 1022 molecules

D 6.02 x 1023 molecules

E)24 molecules

Question 39 Suppose we want to examine the effect of a fertilizer on the size of zucchini produced, and therefore, we need to establish the experimental and control groups. The control group for this experiment would be defined under which conditions? A) soil, water, sun, and zucchini seeds

B) soil, water, sun, and no zucchini seeds

C) soil, fertilizer, water, sun, but no zucchini seeds

D) soil, fertilizer, water, sun, and zucchini seeds

E soil, water, and sun

Question 40 The largest and most complex assembly of proteins in most eukaryotic cells are the: A smooth ER

B ribosomes

C)nuclear pores

D) flagella

E) chromosomes

Question 41 The following amino acid would be characterized as based on the chemical properties of its side chain.

A) basic

B)acidic

C)electrically charged

D )hydrophilic

E) nonpolar

Question 42 The outer membrane of the nuclear envelope is continuous with the membrane of the and is usually covered with attached ribosomes. A) plasma membrane

B) cell wal

C)l chromatin

D) endoplasmic reticulum

E) nucleolus

43—-

-Question 44 Intermediate filaments are most closely associated with which of the following?

A pseudopodia

B)actin

(c) microvilli

D )myosin

E) keratins

Question 45 Sugar dissolves readily in water because it is a (n) substance.

A)ohesive

B hydrophilic

C)evaporative adhesive

E hydrophobic

Question 46 Oxidation occurs when an atom gains one or more electrons.

A True

False

Question 47 What does the term “functional group” mean in reference to the structure of organic molecules? Identify two types of functional groups and describe their chemical properties.

Question 48 The scientific name for coffee is Coffea arabica. More specifically, the species name is arabica.

True

B False

Question 49 What differentiates an organic compound from an inorganic compound?

A An organic compound lacks isotopes.

B)An organic compound lacks valence electrons.

C) An organic compound is basic rather than acidic.

D)An organic compound contains carbon.

E An organic compound contains two or more atoms.

Question 50 Nitrogen has five electrons in its valence shell. How many electrons does it need to gain to complete its valence shell?

A) seven

B eight

C)one

D three

E) two