Bio ch 2

The atomic number of carbon is 6. How many electrons does it contain in its outer valence shell? Please choose the correct answer from the following choices, and then select the submit answer button. 6 4 2 12

4

If phospholipid-like molecules in an alien species had charged tails and uncharged heads, how would these molecules be arranged in alien cell membranes, assuming that the cells and their surroundings are aqueous in the aliens? Please choose the correct answer from the following choices, and then select the submit answer button. The heads would be facing out, and the tails would be facing in. They would have to form a triple layer. The heads would be heads facing in, and the tails would be facing out. Such molecules would not be able to form a stable membrane.

The heads would be heads facing in, and the tails would be facing out.

Whether or not viruses are alive is frequently debated. Name one characteristic of viruses that make them similar to other living organisms. Please choose the correct answer from the following choices, and then select the submit answer button. Viruses seem alive because they can reproduce themselves in host cells. Viruses seem alive because they are made of cells. Viruses seem alive because they can respond to the environment. Viruses seem alive because they can cause disease.

Viruses seem alive because they can reproduce themselves in host cells.

Which molecule(s) can be used for energy storage? Please choose the correct answer from the following choices, and then select the submit answer button. lipids proteins carbohydrates carbohydrates and lipids proteins and lipids

carbohydrates and lipids

The basic structural unit of living organisms is the _____. Please choose the correct answer from the following choices, and then select the submit answer button. cell DNA body organ

cell

pH is a measure of _____. Please choose the correct answer from the following choices, and then select the submit answer button. acidity neutrality concentration of hydrogen atoms basicity

concentration of hydrogen atoms

A chemically pure substance that cannot be broken down is a(n) _____. Please choose the correct answer from the following choices, and then select the submit answer button. compound molecule element cell

element

A researcher has discovered a new substance. No matter what chemical reactions he subjects this substance to, the substance never breaks down. This substance is most likely a new _____. Please choose the correct answer from the following choices, and then select the submit answer button. macromolecule element inorganic molecule carbohydrate organic molecule

element

An amino acid is to a protein as a_____ is to a complex carbohydrate. Please choose the correct answer from the following choices, and then select the submit answer button. nucleotide monosaccharide fatty acid lipid steroid

monosaccharide

Which is NOT a characteristic of a living organism? Please choose the correct answer from the following choices, and then select the submit answer button. reproduction obtaining and using energy movement from place to place growth sensing and responding to the environment

movement from place to place

DNA and RNA are examples of _____. Please choose the correct answer from the following choices, and then select the submit answer button. nucleic acids proteins carbohydrates inorganic molecules

nucleic acids

The monomer of a nucleic acid is a(n) _____.

nucleotide

Which of these contains a monosaccharide as part of its structure? Please choose the correct answer from the following choices, and then select the submit answer button. nucleotides, amino acids, and carbohydrates amino acids carbohydrates nucleotides nucleotides and carbohydrates

nucleotides and carbohydrates

Many monomers linked together in a chain form a

polymer

A scientist has discovered a new macromolecule in mice. He determines that this macromolecule contains a unique combination of 20 distinct monomers, folds into an intricate three-dimensional shape, and is involved in a distinct chemical reaction. This scientist has likely discovered a _____. Please choose the correct answer from the following choices, and then select the submit answer button. nucleic acid carbohydrate protein lipid

protein

A positively charged subatomic particle found in the nucleus of an atom is the _____. Please choose the correct answer from the following choices, and then select the submit answer button. electron neutron proton element

proton

An element's identity, its atomic number, depends on the number of _____ it contains. Please choose the correct answer from the following choices, and then select the submit answer button. protons neutrons protons and electrons electrons

protons

Which functional trait of a living organism is a mule NOT capable of? Please choose the correct answer from the following choices, and then select the submit answer button. reproduction growth homeostasis responding to the environment responding to stimuli

reproduction

A botanist is exposing plants to a one-sided light source. Over time, these plants appear to "bend" toward the light. The botanist has just observed which characteristic of life? Please choose the correct answer from the following choices, and then select the submit answer button. reproduction growth homeostasis response to stimuli

response to stimuli

Which type of molecule is NOT made up of a chain of repeating monomers? Please choose the correct answer from the following choices, and then select the submit answer button. RNA DNA proteins steroids complex carbohydrates

steroids

Which of these would NOT be considered monomers? Please choose the correct answer from the following choices, and then select the submit answer button. nucleotides monosaccharides amino acids sterols

sterols

Homeostasis is _____. Please choose the correct answer from the following choices, and then select the submit answer button. the overall lifetime growth of an organism the ability to do work the maintenance of a relatively stable environment all of the chemical reactions taking place within the cell the ability to respond to stimuli

the maintenance of a relatively stable environment

If life is found on other planets, it may or may not use the chemical framework used by life on Earth. Please choose the correct answer from the following choices, and then select the submit answer button. true false

true

Viruses reproduce by infecting a host cell and hijacking its cellular machinery to make copies of itself. Please choose the correct answer from the following choices, and then select the submit answer button. true false

true

Water is considered a polar molecule. Please choose the correct answer from the following choices, and then select the submit answer button. true false

true

An infectious agent made up of a protein shell that encloses genetic information is a _____. Please choose the correct answer from the following choices, and then select the submit answer button. bacterium virus protozoan parasite fungus

virus

The atomic mass of neon is 20. This means it has _____. Please choose the correct answer from the following choices, and then select the submit answer button. 20 proteins 10 protons and 10 neutrons 20 electrons 10 protons and 10 electrons 20 neutrons

10 protons and 10 neutrons

Which of these is an example of a nucleic acid? Please choose the correct answer from the following choices, and then select the submit answer button. protein fat DNA sugar glucose

DNA

An alchemist is trying to create a human body by mixing together various elements. Which element would he NOT need to add to his reaction (i.e., which element is found in a human body)? Please choose the correct answer from the following choices, and then select the submit answer button. nitrogen oxygen calcium carbon Nitrogen, oxygen, calcium, and carbon are all part of the human body.

Nitrogen, oxygen, calcium, and carbon are all part of the human body.

A substance that increases the hydrogen ion concentration of a solution is a(n) _____. Please choose the correct answer from the following choices, and then select the submit answer button. base acid solute solvent

acid

Microscopic organisms are expected to be found in _____. Please choose the correct answer from the following choices, and then select the submit answer button. radioactive wastes almost every location on Earth places with liquid water only deep hydrothermal vents the Antarctic

almost every location on earth

The monomers of proteins are _____. Please choose the correct answer from the following choices, and then select the submit answer button. nucleotides nucleic acids lipids amino acids monosaccharides

amino acids

The smallest unit of an element that cannot be chemically broken down into smaller units is the _____. Please choose the correct answer from the following choices, and then select the submit answer button. molecule atom compound ion

atom

The number of protons an element has is its _____, whereas the number of electrons will determine _____. Please choose the correct answer from the following choices, and then select the submit answer button. atomic number; atomic mass atomic number; the type of bond it can form atomic mass; atomic number mass number; atomic number atomic mass; the type of bond it can form

atomic number; the type of bond it can form

A news item from December 2014 announced that NASA had identified a novel form of bacterial life from Mono Lake in California. Unlike other living organisms, which require carbon, hydrogen, nitrogen, sulfur, oxygen, and phosphorus to survive, this bacterium is able to live and grow without a supply of carbon, hydrogen, nitrogen, sulfur, oxygen, and arsenic. The essential items required by this bacterium (such as nitrogen) are _____. Please choose the correct answer from the following choices, and then select the submit answer button. amino acids macromolecules atoms elements

elements

Which statement does NOT apply to the term "energy"? Please choose the correct answer from the following choices, and then select the submit answer button. Living organisms may obtain energy from food. Energy can come from sunlight. Energy can be consumed from the environment. Energy is the ability to do work. Energy is maintenance of a relatively stable environment.

energy is maintenance of a relatively stable environment

n a NASA mission that was looking for life on Mars, soil samples were taken and measured for the breakdown of nutrients and the production of carbon dioxide gas. Which characteristic of life would this test measure? Please choose the correct answer from the following choices, and then select the submit answer button. breathing growth homeostasis energy use reproduction

energy use

The maintenance of a relatively constant internal environment as found in living organisms is termed_____. Please choose the correct answer from the following choices, and then select the submit answer button. homeostasis constancy neutrality normal

homeostasis

One of the symptoms of rabies is a fear and avoidance of water. This symptom can be described as a _____ behavior. Please choose the correct answer from the following choices, and then select the submit answer button. membrane viral hydrophobic positive

hydrophobic

A strong electrical attraction between opposite charged ions is a(n) _____ bond. Please choose the correct answer from the following choices, and then select the submit answer button. weak hydrogen ionic covalent

ionic

Table salt is made up of oppositely charged ions, which are attracted to one another and form _____ bonds. Please choose the correct answer from the following choices, and then select the submit answer button. polar hydrogen ionic covalent

ionic

Anything that takes up space and has mass is _____. Please choose the correct answer from the following choices, and then select the submit answer button. matter a solid a liquid an atom

matter

The term _____ refers to the chemical reactions that occur in the cell of a living organism. Please choose the correct answer from the following choices, and then select the submit answer button. metabolism homeostasis anabolism growth reproduction

metabolism

Atoms linked by covalent bonds are called _____. Please choose the correct answer from the following choices, and then select the submit answer button. molecules ions isotopes protons

molecules