Question

in a neutrally charged atom * 1 point
there are only neutrons in the nucleus.
the number of neutrons and electrons are the same.
the number of electrons matches the total number of protons and neutrons.
the number of protons and electrons are the same.
there is an absence of charged particles.

signal transduction is usually initiated when * 1 point
when a protein kinase is activated.
a signal molecule binds to and changes the receptor in some way.
when a second messenger is made.
when an effector enzyme is activated.
when calcium is released from the endoplasmic reticulum.

the tertiary structure of a protein is determined by its * 1 point
interactions among r groups.
right - handed coil.
peptide bonds.
glycosidic linkages.
hydrogen bonding between the atoms in the polypeptide backbone

surface tension and cohesion occur in pure water because * 1 point
forms nonpolar bonds.
resists the breaking of ionic bonds.
resists the breaking of hydrogen bonds.
forms ionic bonds.
forms weak bonds.

amino and carboxyl functional groups tend to form bases and acids by gaining or losing * 1 point
a neutron
a proton
an electron
a pair of electrons
a plus or a minus
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Explanation:

1. In a neutrally - charged atom, protons (positively charged) and electrons (negatively charged) balance each other out, so the number of protons and electrons is the same.
2. Signal transduction is usually initiated when a signal molecule binds to a receptor and causes a conformational change in the receptor.
3. The tertiary structure of a protein is determined by interactions among R - groups, which can include hydrophobic interactions, ionic bonds, hydrogen bonds, and disulfide bridges.
4. Surface tension and cohesion in pure water occur because water resists the breaking of hydrogen bonds. Hydrogen bonds hold water molecules together.
5. Amino groups can accept a proton (H⁺) to form a base, and carboxyl groups can donate a proton to form an acid.

Answer:

1. the number of protons and electrons are the same.
2. a signal molecule binds to and changes the receptor in some way.
3. interactions among R groups.
4. resists the breaking of hydrogen bonds.
5. a proton