The events of excitation-contraction coupling in cardiac muscle cells are similar to skeletal muscle cells through electrical activity. <span />
A. It has organelles enclosed in membranes
<span>c. numbers of neutrons.</span><span>
Isotopes are atoms of the same element with the same number of protons and same number of electrons but with <span>different number of neutrons. They differ in the number of neutrons that is why they also differ in mass numbers. Since they have the same number of protons, they have the same atomic number.
For instance, when the nucleus of the isotope with a 68.926 amu, there are 30 protons and 39 neutrons in the nucleus. The best example for this is Zn (zinc-69 isotope) and Ga (gallium-69 isotope) which has 68.926 amu and 68.925 amu respectively. </span></span>
Only males can be carriers for X-linked recessive traits, False, it should read "Only females can be carriers for X-linked recessive traits."
<h3>What is an allele in a gene?</h3>
An allele is defined as an allele is a variant form of a gene.
For example, if both of your parents have green eyes, you might inherit the characteristic of green eyes from them.
Or if your motherhas freckles, you might have freckles too because you inherited the characteristic for freckles
Thus, option "A" is correct.
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Wind can use sand as an abrasive to wear away rock.
Option (d);
<u>EXPLANATION: </u>
- Rocks are broken down into smaller pieces with sand or water flowing over the rocks at a great speed.
- Many solid particles like soil, sand, mud, etc. move down the rocks by downhill or wind blowing in the downward direction and called wind abrasion.
- Sand blown with the help of high speed, sandblast away the rocks.
- Abrasion is a process in which sand is blown in downwards direction with the help of wind and that wears away the rock's surface over time.
- Thus, wind uses sand as an abrasive to wear away a rock.
