<span>BACTERIA
Gram-positive bacterium used widely for industrial production of fermented dairy products such as milk, cheese, and yogurt-</span><span><span>Lactococcus lactis</span> </span>
DescriptionSustainable agriculture is farming in sustainable ways, which means meeting society's present food and textile needs, without compromising the ability for current or future generations to meet their needs. It can be based on an understanding of ecosystem services.
Answer:
a. + glucose, + lactose = On
b. - glucose, - lactose = Off
c. + glucose, - lactose = Off
d. - glucose, + lactose = On
Explanation:
Lac operon has both types of control, repressible and inducible.
Whenever glucose level is low in the cell, an enzyme known as adenylyl cyclase raises the level of cAMP which forms a dimer with CRP protein and they both act as activator of lac operon and cause expression.
Apart from this, when lactose is present in the cell, β-galactosidase enzyme metabolizes lactose to form allolactose which causes allosteric repulsion in the lac repressor and causes its removal from the operator. As soon as repressor is removed lac operon gets activated.
In wild type lac operons, the expression of lac operon occurs when glucose level is low in the cell and lactose is present but in this mutant presence or absence of glucose will not make a difference because CRP will bind Plac promoter independent of cAMP level i.e. activator CRP will work even in high glucose concentration. If lactose is present then lac operon will always express so in option 'a & d' lac operon will express but in option 'b & c' it will not express.
Answer: (1) It has a tail to travel to the egg (2) contains a nucleus in the head which will fertilise the egg
Explanation: Firstly it has a tail to help it travel to the egg. Secondly it contains the nucleus in the head that will fertilise the egg. Thirdly the acrosome contains enzymes in order for the sperm to penetrate the egg. Finally, the sperm cell is packed with mitochondria to provide the energy needed to reach the egg.
In living things, there are 6 common elements that can be found: carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus. Among these, the major ones are carbon, hydrogen, oxygen and nitrogen.
The most important of all that characterizes organic matter from the rest, is the presence of carbon. Carbon is a versatile element because it can bond to itself to an unlimited length. Because of this, it makes itself as host to other functionalities like hydroxide, amines and many more. The combination of a length of carbon chains with other of these major elements make up the basic compounds that our body needs. Compounds like carbohydrates, lipids, hormones, proteins and even our DNA and RNA strands are made up of these major elements.
