Answer:
The two main DNA lesions formed by exposure to UVB are cyclobutane pyrimidine dimers (CPD) and 6-4 pyrimidine pyrimidone photoproducts (6-4PPs), and its Dewar isomers.
Answer:
Cyanobacteria
Explanation:
Cyanobacteria were the first photosynthetic autotrophs that used water molecules as the source of electrons. Cyanobacteria were the first autotrophs that performed oxygenic photosynthesis and carried out the splitting of water.
The process of splitting water released oxygen as a gas (O2) which was released in the atmosphere of the earth as a by-product. This led to the accumulation of oxygen in the atmosphere. Some cyanobacteria can fix nitrogen and have specialized cells called heterocyst which serve as the site for nitrogen fixation.
Answer:
Explanation:
The mass of the substance is determined by subtracting the first reading from the second. A container holding the substance of interest is placed on the balance and weighed. This is the first reading. The substance to be used is removed from the container and the container weighed again.
Answer:
The correct answer is Smooth ER: protein synthesis
Explanation:
Endoplasmic reticulum is a single membrane-bound organelle containing interconnected membrane-bound cisternae which are the extension of the nuclear membrane. Endoplasmic reticulum is divided into two parts smooth endoplasmic reticulum and rough endoplasmic reticulum.
Smooth endoplasmic reticulum does not contain ribosomes on it and is involved in the synthesis of steroid hormones and lipids, detoxification of harmful products and removal of xenobiotic from the cell, calcium storage, and metabolism.
Rough endoplasmic reticulum has ribosomes on its surface which helps in protein synthesis on RER. So Smooth ER and protein synthesis are incorrectly matched.
This is active transport so the ions go against the concentration gradient. This means that the ions will travel from the place where there are less sodium ions(from the inside of the cell) to the place where there are more sodium ions (to the outside of the cell).